... 弹簧扣盖 snap-on cover 弹簧扩张器 spring expander 弹簧拉钩 snap clasp ...
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coil spring expander 螺旋弹簧拉伸器
spring expander oil ring 弹簧胀圈油环
with coil-spring expander 螺旋弹簧胀圈活塞环
ring with coil-spring expander 螺旋弹簧胀圈活塞环
ring with coil spring expander 螺旋弹簧胀圈活塞环
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The four-spring rectangle chest-expander has the function of the existing chest-expander with single spring ends connecting handles, and besides, has the functions of bending elbows and drawing chest.
它除了有现有的单簧两端连接把手的臂力器的使用功能外，也能做屈肘、收胸的运动。
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